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Strange roundish pyreno
Enrique Rubio, 26-09-2012 20:25
Enrique RubioDear friends:

Have you some idea about this strange roundish, densely gregarious,
uniperitheciate pyrenomycete, up to 0.7-0.8 microns in diam, covered by a
conspicuous white material? It was collected on the underside of a woody piece
(perhaps Salix).


The asci have a little refringent apparatus IKI and Melzer negative and the ascospores
(2-guttulate in H2O) have any germ slit (or it is very inconspicuous).


When I began to study it, my material was very damaged and for it I cannot do a good description but I see any dark peridial setae of Coniochaeta-type


Many thanks again
Enrique  

  • message #19859
  • message #19859
Jacques Fournier, 26-09-2012 20:56
Jacques Fournier
Re : Strange roundish pyreno
Hola Enrique,
I agree with you this likely a Coniochaeta. They don't all have conspicuous setae, you should check the ostiolar region in a crush mount, you may find small setae.
Regarding a possible species name I have no idea! Maybe Andy?
Good luck!
Jacques
Enrique Rubio, 26-09-2012 21:11
Enrique Rubio
Re : Strange roundish pyreno
Thanks, Jacques.
But the spores have not conspicuous germ-slits as the typical Coniochaeta species!
I can't to study more the perithecia because they are dead
Andrew N. Miller, 26-09-2012 22:12
Andrew N. Miller
Re : Strange roundish pyreno
Probably a Coniochaeta, but what species I do not know.

Andy
Enrique Rubio, 27-09-2012 16:47
Enrique Rubio
Re : Strange roundish pyreno
Thank you Jacques and Andrew
Peter Welt, 27-09-2012 19:52
Peter Welt
Re : Strange roundish pyreno
Although I have no idea, but it can not be Coniochaeta because no three-dimensional spores.


Peter
Enrique Rubio, 27-09-2012 20:37
Enrique Rubio
Re : Strange roundish pyreno
No, Peter. As you say, the spores are not three-dimensional
Björn Wergen, 29-11-2012 11:00
Björn Wergen
Re : Strange roundish pyreno
Hi Enrique,

your species reminds me somewhat of Boliniaceae, especially if you look at the spores on the left site (2guttulate, as you described). Arrangement in Asci is similar to that in C. microspora, for example. Only the apical apparatus does not fit to "Camarops". I do not know Boliniaceae very well but I think you should look there.

regards,
björn
Andrew N. Miller, 29-11-2012 16:37
Andrew N. Miller
Re : Strange roundish pyreno
Members of the Boliniales form perithecia imbedded in a stroma, not individual perithecia as in this specimen.

Andy
Björn Wergen, 29-11-2012 20:17
Björn Wergen
Re : Strange roundish pyreno
Ok, I thought Boliniales has members without a stroma. I have photos of Lentomitella cirrhosa and this one looks like as if there is no stroma (watch Alain's photo).

regards,
björn
Andrew N. Miller, 29-11-2012 20:35
Andrew N. Miller
Re : Strange roundish pyreno
Yes, you are correct.  Lentomitella does not have a stroma, but it occurs in a large, diverse polyphyletic clade unofficially called "Ceratosphaeriales" sensu lato, near the Diaporthales, Ophiostomatales, and Chaetosphaeriales.  It has nothing to do with the Boliniales.

Andy
Thomas Læssøe, 30-11-2012 15:53
Re : Strange roundish pyreno
I would not rule Xylariaceae out. There are many taxa that are not amyloid and the surface of these "perithecia" strongly resembles uniperitheciate stromata of various Xylariaceae. The spore shape is fine for Xylariaceae, less fine for Boliniaceae and Coniochaeteaceae. I do not have a species suggestion :-)

cheers